1 AC_DEFUN([AC_COMPILE_CHECK_SIZEOF],
2 [changequote(<<, >>)dnl
3 dnl The name to #define.
4 define(<<AC_TYPE_NAME>>, translit(sizeof_$1, [a-z *], [A-Z_P]))dnl
5 dnl The cache variable name.
6 define(<<AC_CV_NAME>>, translit(ac_cv_sizeof_$1, [ *], [_p]))dnl
8 AC_MSG_CHECKING(size of $1)
9 AC_CACHE_VAL(AC_CV_NAME,
10 [for ac_size in 4 8 1 2 16 12 $2 ; do # List sizes in rough order of prevalence.
11 AC_TRY_COMPILE([#include "confdefs.h"
12 #include <sys/types.h>
14 ], [switch (0) case 0: case (sizeof ($1) == $ac_size):;], AC_CV_NAME=$ac_size)
15 if test x$AC_CV_NAME != x ; then break; fi
18 if test x$AC_CV_NAME = x ; then
19 AC_MSG_ERROR([cannot determine a size for $1])
21 AC_MSG_RESULT($AC_CV_NAME)
22 AC_DEFINE_UNQUOTED(AC_TYPE_NAME, $AC_CV_NAME, [The number of bytes in type $1])
23 undefine([AC_TYPE_NAME])dnl
24 undefine([AC_CV_NAME])dnl
27 AC_DEFUN([AC_C_BIGENDIAN_CROSS],
28 [AC_CACHE_CHECK(whether byte ordering is bigendian, ac_cv_c_bigendian,
29 [ac_cv_c_bigendian=unknown
30 # See if sys/param.h defines the BYTE_ORDER macro.
31 AC_TRY_COMPILE([#include <sys/types.h>
32 #include <sys/param.h>], [
33 #if !BYTE_ORDER || !BIG_ENDIAN || !LITTLE_ENDIAN
35 #endif], [# It does; now see whether it defined to BIG_ENDIAN or not.
36 AC_TRY_COMPILE([#include <sys/types.h>
37 #include <sys/param.h>], [
38 #if BYTE_ORDER != BIG_ENDIAN
40 #endif], ac_cv_c_bigendian=yes, ac_cv_c_bigendian=no)])
41 if test $ac_cv_c_bigendian = unknown; then
43 /* Are we little or big endian? From Harbison&Steele. */
47 char c[sizeof (long)];
50 exit (u.c[sizeof (long) - 1] == 1);
51 }], ac_cv_c_bigendian=no, ac_cv_c_bigendian=yes,
52 [ echo $ac_n "cross-compiling... " 2>&AC_FD_MSG ])
54 if test $ac_cv_c_bigendian = unknown; then
55 AC_MSG_CHECKING(to probe for byte ordering)
58 short ascii_mm[] = { 0x4249, 0x4765, 0x6E44, 0x6961, 0x6E53, 0x7953, 0 };
59 short ascii_ii[] = { 0x694C, 0x5454, 0x656C, 0x6E45, 0x6944, 0x6E61, 0 };
60 void _ascii() { char* s = (char*) ascii_mm; s = (char*) ascii_ii; }
61 short ebcdic_ii[] = { 0x89D3, 0xE3E3, 0x8593, 0x95C5, 0x89C4, 0x9581, 0 };
62 short ebcdic_mm[] = { 0xC2C9, 0xC785, 0x95C4, 0x8981, 0x95E2, 0xA8E2, 0 };
63 void _ebcdic() { char* s = (char*) ebcdic_mm; s = (char*) ebcdic_ii; }
64 int main() { _ascii (); _ebcdic (); return 0; }
66 ] if test -f conftest.c ; then
67 if ${CC-cc} ${CFLAGS} conftest.c -o conftest.o && test -f conftest.o ; then
68 if test `grep -l BIGenDianSyS conftest.o` ; then
69 echo $ac_n ' big endian probe OK, ' 1>&AC_FD_MSG
72 if test `grep -l LiTTleEnDian conftest.o` ; then
73 echo $ac_n ' little endian probe OK, ' 1>&AC_FD_MSG
74 if test $ac_cv_c_bigendian = yes ; then
75 ac_cv_c_bigendian=unknown;
80 echo $ac_n 'guessing bigendian ... ' >&AC_FD_MSG
83 AC_MSG_RESULT($ac_cv_c_bigendian)
85 if test $ac_cv_c_bigendian = yes; then
86 AC_DEFINE(WORDS_BIGENDIAN, 1, [whether byteorder is bigendian])
87 AC_DEFINE(HOST_WORDS_BIG_ENDIAN, 1,
88 [Define if the host machine stores words of multi-word integers in
94 AC_DEFINE_UNQUOTED(BYTEORDER, $BYTEORDER, [1234 = LIL_ENDIAN, 4321 = BIGENDIAN])
95 if test $ac_cv_c_bigendian = unknown; then
96 AC_MSG_ERROR(unknown endianess - sorry, please pre-set ac_cv_c_bigendian)